Boiler.



No. 890,129. PATENTBD SEPT. 4', 1906.

w. W. BoNsoN. BOILER. APPLIOA'MOVN FILED JUNI: 9,1903.

YOQOOOOQGQ/ 000000000 @OQQGOOQO kx boxes.

' junction-box.

UNITED STATES PATENT OFFICE.

WILLIAM W. BONSON. OF DUBUQUE, IOVA, ASSIGNOR TO BONSON FURNACE ANDBOILER COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

BOILER.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed Tune 9, 1903. Serial No. 160,678.

To all whom t may concern:

Be it known that I, WILLIAM W. BoNsoN, a citizen of the United States,residing' in the city and county of Dubuque and State of Iowa, haveinvented. certain new and useful yImprovements in a Combined Boiler andFurnace; and I do hereby declare the following to be a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same.

My invention belongs to the class known as steam boilers and furnaces,and one of the objects is to secure a rapid, positive, and uninterruptedcirculation of the water through all the parts of the boiler, therebymaintaining the temperature nearly the same in the different parts ofthe boiler.

Another object is to provide for the unequal contraction and expansionand resultant strain therefrom, together with the loosening and breakingof the joints due to the unevenness and irregularity of the hre on thegrate-bars and the varying temperature occasioned thereby, whereby theboiler is ren dered much more safe and durable.

It consists, essentially, in a boiler set over a sectional furnaceprovided with a grate and water-tubes and fire-brick forming a roof forthe furnace and said water-tubes attached in sections to the watercommunication between the boiler and furnace.

For the better comprehension and more thorough understanding of myinvention attention is called to the following specification, when takenin connection with the drawings accompanying the same and forming a parthereof.

Figure 1 is a longitudinal section of the boiler and furnace. Fig. 2 isan end view with forward portion of the i'ire-b ox removed.` Fig. 3 is asection of one of the junction- Fig. 4 is a section of the central Like.letters 'of reference denote corresponding parts in each of thedrawings.

Referring to the drawings, A represents the upper tubular boilerprovided with a shell B and front and rear Hue-sheets C and D. Into theflue-sheets are secured in any well-known manner the fire-hues G.Between the flues and the shell is a water-space E and steam-chamber F.

Beneath the boiler A is a furnace H, constructed as follows: In theforward portion of the furnace are set grate-bars I, resting upon across-bar J and the rear ends upon a bridgewall K, sufficiently elevatedto provide an ash-box L beneath the grate. This grate forms the base ofthe fire-box M. Over this grate and forming a roof for the furnace arearranged water-tubes N, covered with firebrick O and asbestos or othernon-conducting material P` These water-tubes with the covering also forma fire-flue Q, extending from the rear of the fire-box to the end of thefurnace. By this mode of construction there is formed a sectionalfurnace consisting of a ire box and flue and provided with reproofmaterial and water-tubes laid in sections to form a covering for boththe iire box and flue, whereby the furnace may be easily repaired andthe products of combustion from the furnace revented from coming indirect contact with) the shell of the boiler.

For the purpose of roviding a water communication between t ie boilerand the watertubes which form the arch of the fire-box and makingprovision for relieving the strain caused by the unequal expansion andcontraction of the water-tubes when subjected to varient degrees oftemperature there are secured into the boiler A water-tubes R, each ofwhich extends downward and is united to and opens into a junction-box S.These tubes R form the front water-leg. These junction-boxes consist ofa steel shell T, provided with openings s, in which the Watertubes N aresecured. Within the opposite side and in a line parallel with theopenings s are other openings U, which are closed by screw-plugs V. Atone end of the box is another opening V, in which is secured one of thewater-tubes R, and within the opposite end an opening Z, which isinclosed by a screw-plug X.

The manner in which the water-tubes N and R are secured in thejunction-box is by inserting the water-tube in one of the openings s,then removing the screw-plug V, and

IOO

inserting through the opening the tool for expanding the tube N into theopenings.

The tubes R are secured in the junctionbox through the openings W by thetool inserted through the openings Z in the same manner as the tubes Nin the openings s. I

have shown four ofthe tubes N in each junction-box; but it is manifestadifferent number may be used or only one tube with an individualjunction-box may be employed. By this mode of construction of thejunctionboXes and attachment of the tubes with the screw-plugs oppositeof the opening of the tubes there is provided an easy access to thetubes whereby they may be secured in the box and also cleaned orinspected.

A't the rear the tubes N may be secured in the same manner as at theforward end to form the rear water-leg g but this is not an absolutenecessity, as the heat is more even at the rear of the flue Q and lessexpansion and contraction. Hence there may be in the rear only one tubeR of much larger dimension and one junction-box forming the arch of thefurnace and forming the rear of the flue Q.

At the rear of the furnace and the boiler there is constructed a backconnection or back combustion-chamber a, which conducts the products ofthe combustion from the flue of the furnace up into the iiues G of theboiler. This back connection is preferably construlcted of brick b andlined withl sheetstee It will be understood that as the waterleg andcovering of the furnace is formed in section if one section shouldreceive an VeX- cessive amount of heat, causing an overexpansion, or iffor any cause there should be a sudden contraction it lwould in nomanner affect the other sections, as each section is entirelyindependentof the others. Thus the life and efhciency of the tubes and furnace willbe largely extended. Also if a section should become injured in anymanner it can be readily replaced without disturbing the other sectionsof the furnace.

It will also be observed that as the water is brought to an exceedinglyhigh temperature in the tubes N there will be a rapid circulation fromthese'tubes up through the rear water-leg into the boiler and an equalcirculation from the boiler down through the front water-leg, and inthis manner the tubes will always be kept clean and will mosteffectively absorb the heat.

Having now described my invention, what I claim is- 1. In a device ofthe character described, a vfurnace consisting of a grate,junctionboxes, water-tubes arranged in sections longitudinally along thefurnace and each section entering a junction-box, fire-brick disposedalong the water-tubes and forming with the water-tubes andjunction-boxes a covering for the entire furnace, in combination with atubular boiler, and water communication between the boiler and eachsection of the water-tubes in the furnace.

2. In a device of the charac-ter described, a furnace consisting of afire-box yand combustion-chamber, water-tubes Larranged in seamssections, each section consisting of a plurality of tubes secured in thejunction-boxes, fire-brick with the tubes and junction-boxes forming thefurnace, a tubular boiler, and water communication between the boilerand each section of the covering of the furnace through thejunction-boxes.

3. In a device of the character described, a boiler, a grate abridge-wall, a flue, watertubes arranged in sections over the furnace,means disposed along said water-tubes for protecting the boiler from thedirect heat of the furnace and forming a re communication With thefirst-mentioned flue, a water-tube connecting each section of thewater-tubes in the furnace with the boiler at the front, a rearwater-leg in the rear, and water communication between t'he water-tubesin the furnace and the boiler through the rear waterleg.

o4. In a device of the character described, the combination of a boiler,a fire boX and flue, water-tubes set in sections longitudinally over thefire box and flue, a junctionbox into which a plurality of water-tubesopen and are secured, means disposed along said water-tubes andjunction-boxes in the furnace for protecting the boiler from the directaction of the heat of the furnace and forming said Hue for leading theproducts of combustion from the furnace, a water-tube connecting eachjunction-box with the boiler and forming a water communication betweenthe water in the tubes in the furnace and the water in the boiler.

5. In a device of the character described, a tubular boiler, a furnaceset on an incline beneath the boiler and consisting of a fireboX andcombustion-chamber, junctionboXes provided with openings on oppositesides, water-tubes arranged in sections and` each tube secured in one ofthe openings of the junction-boxes, non-combustible material disposedalong the water-tubes and junction-boxes and with them forming thefireboX and combustion-chamber, a water-tube connecting eachjunction-box with the boiler, and a back connection connecting theVfurnace with the flues in the boiler.

6. In a device of the character described, a tubular boiler, a furnaceconsisting of a grate, water-tubes set in sections over the grate, ajunction-box for each section provided with openings on opposite sidesfor insertion and inspection of the water-tubes, and water communicationbetween the boiler and each section of the water-tubes.

7. In a device of the character described, a sectional furnaceconsisting of a grate, water-tubes arranged in sections, a sectionalprotective covering disposed along said watertubes to protect the boilerand forming a flue for conducting the roducts of combustion thereto, ajunction-box for each section of the water-tubes provided with openingsIOO in opposite sides of the box, a Water-tube in each opening upon oneside and a plug for each opening upon the opposite side, a watertubeconnecting each section with the tubular boiler and a back connectionconnecting with the flue of the furnace with the flues of the boiler.

8. In a device of the character described, a tubular boiler providedwith fire-flues, a furnace consisting of a fire-box and ire-flues,junction-boxes, water-tubes set in sections and running longitudinallyof the fire boX and flue and opening into the junction-boxes,non-combustible material disposed along the water-tubes andjunction-boXes and forming with the water-tubes and junction-boxes acovering for the entire furnace, water communication between the boilerand the watertubes in the furnace through each junctionbox, and firecommunication between the flues of the furnace and the flues of theboiler.

9. In a device of the character described, a boiler, a furnace having afire-box and combustion-chamber consisting of water-tubes arrangedlongitudinally, noncombustible material, said tubes and non-combustiblematerial arranged in sections and forming the furnace, and watercommunication between the boiler and the tubes in the furnace.

10. In a device of the character described, a boiler, a furnaceconsisting of junctionboxes, water-tubes arranged in sections and eachsection connected with a non-combustible material disposed along thejunction-boxes and tubes and with the said j unction-boxes and tubes andforming the furnace, and water communication between the water-tubes inthe furnace and the boiler through each j unction-box.

In testimony whereof I have signed my name to this Speciiication in thepresence of two subscribing witnesses.

WILLIAM W. BONSON.

j unction-boX,

